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Gao J.,Zibo Vocational Institute
Synthesis and Reactivity in Inorganic, Metal-Organic and Nano-Metal Chemistry | Year: 2014

A new zinc(ιι) coordination polymer with 2,5-thiophene dicarboxylic acid (H2tda) and 1,4-bis(2-methyl-1H-imidazol-1-ylmethy) benzene(bmib) has been prepared by hydrothermal synthesis and characterized by single-crystal X-ray diffraction, IR, and EA. Complex [Zn2(tda) 2(bmib)]n (1), is monoclinic, space group C2/c with a = 14.215 (2), b = 16.579(3), c = 14.711(3) Å, β = 90.823(6)°, V = 3467(2) Å3, Z = 8, Mr = 737.36, Dc = 1.413 g/cm3, F(000) = 1496and μ = 1.553 cm-1. The final refinement gave R = 0.0535 and wR = 0.0682 for 3104 reflections with I > 2σ(I). X-ray diffraction analysis reveals that the title compound [Zn 2(tda)2(bmib)]n (1) displays a twofold interpenetrating three-dimensional pcu network. Furthermore, the luminescent property of complex 1 is investigated, which demonstrates that [Zn 2(tda)2(bmib)]n(1) may be a good candidate as a photoactive material. Copyright © Taylor & Francis Group, LLC.


I have performed quantum chemical calculations for the CF3X (X = Cl, Br){bullet operator}{bullet operator}{bullet operator}Au(n) (n = 2, 3, and 4) complexes at M05-2X/aug-cc-pVDZ(PP) level. Two types of optimized structures were obtained. Type I complexes are stabilized by the coordination force between the negative electrostatic potential of halogen atom and the gold atom, and type II complexes contain halogen bonds formed between the σ-hole of the halogen atoms and the negative electrostatic potential of Aun. Results of the interaction energy indicate that type I complexes are more stable than type II complexes. AIM analysis reveals that type II complexes are a closed shell interaction and there is a partially covalent nature for type I complexes.


Li X.-Y.,Zibo Vocational Institute
Acta Crystallographica Section E: Structure Reports Online | Year: 2011

In the title compound, C 15H 12BrClN 2O 2, the dihedral angle between the two substituted aromatic rings is 77.8 (3)°. The molecule exists in a trans conformation with respect to the methylidene unit. In the crystal structure, inversion dimers linked by pairs of N - H⋯O hydrogen bonds generate R 2 8(8) loops.


Li X.-Y.,Zibo Vocational Institute
Acta Crystallographica Section E: Structure Reports Online | Year: 2011

In the title compound, C 15H 12C l2N 2O 3, the dihedral angle between the two substituted aromatic rings is 5.4 (4)°. Intra-molecular O - H⋯N and N - H⋯O hydrogen bonds affect the planarity of the molcular conformation, with a mean deviation from the plane defined by the non-H atoms of 0.062 (2) Å. The mol-ecule exists in a trans configuration with respect to the methyl-idene unit. In the crystal, mol-ecules are linked by N - H⋯O inter-actions. © Xiao-Yan Li 2011.


Zhang L.-R.,Zibo Vocational Institute
Applied Mechanics and Materials | Year: 2014

Design and selection of hydraulic support is the core of coal mine fully mechanized mining equipment selection and matching, determine the hydraulic supporting strength Using the numerical simulation method and shallow buried depth of roof structure of theoretical calculation method, determines the necessary technical parameters such as the support frame, the bracket height and the bottom plate pressure According to the coal seam thickness and coal seam structure, which has the instructive meaning in application. Equipment selection and matching of Comprehensive mining coal face is one of the important material base, coal achieve reaches producing direct relationship between the working surface of the smooth realization of the goal, is related to the stability and reliability of fully mechanized equipment. Face "compressors": hydraulic support, coal winning machine and scraper conveyor selection is very important, the design of the hydraulic support selection is the core. © (2014) Trans Tech Publications, Switzerland.

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